The
best manifestation of Honda's modular approach.
If you look at the 223c mill of the Karizma, you can make
out the familiar streak that runs through the engines on
the CBZ and the Ambition. No prizes on this count as to
the reason but the 223cc Karizma engine represents - for
the moment - the maximum capacity this modular design theme
can be taken to. The crankcase is of virtually the same
size though the covers do have some detail differences and
the engine mounts are the same as in the other two bikes
and completing the picture are the scaled-up barrel (with
an additional fin) and head.
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| This
is an engine architecture seen earlier - on the CBZ
and the Ambition - never in the form and manner in which
it excells as on the Karizma. Great motor finally comes
good. |
The single overhead cam motor features slightly undersquare
cylinder dimensions with a 65.5mm bore and a 66.2mm stroke
to give a 223cc swept volume. Hero Honda has designed in
the latest convex-type combustion chamber (compression ratio
being 9.0 : 1) for silent running and good power delivery
while also giving it the latest Keihin VE 3EA constant vacuum
type carburettor which also packs in the CCVI switch. The
CCVI term stands for carb-controlled variable ignition timing
which as it suggests actuates - via throttle position -
one of two ignition maps, for low and high speed operation.
This was one area which disappointed appreciably in the
CBZ wherein the engine sounded and felt harsh as one went
past the middle range but here this detail has eliminated
such a glitch completely. Just for the record, the 223cc
engine gets the latest version of Honda's AMI (advanced
microprocessor ignition) system which incorporates a three
tier, multi-stage digital ignition system.
The all aluminium alloy engine (with pressed-in steel liner)
features an automatic cam chain tensioner, an air cut off
valve (to prevent afterburning in the exhaust muffler) and
like on the CBZ and Ambition, an air injection valve to
keep tail pipe emissions in check. With all this and the
extra cubic capacity, the Karizma engine develops 16.76bhp
at 7000rpm and 18.35Nm of torque at 6000rpm. This is about
2bhp and 5Nm more than what the Pulsar 180 makes but the
reasoning is that the engine had to be stressfree and this
fact holds true when out On
the Roads.
Transmission is via a five-speed gearbox which has had its
final drive ratios revised from those in the CBZ. A stronger
multi-plate clutch is used to take care of the enhanced
power and torque figures. This time round Hero Honda has
not faulted and equipped the engine withan electric starter
even though the kick starter to be actuated requires the
front right footrest to be folded out of the way.
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